PET is milky white or light yellow, highly crystalline polymer with smooth and shiny surface. It has excellent physical and mechanical properties in a wide temperature range, the long-term use temperature can reach 120℃, and its electrical insulation is excellent. Even at high temperature and high frequency, its electrical properties are still good, but its corona resistance is poor, creep resistance, fatigue resistance, friction resistance and dimensional stability are all good. PET has ester bond, which will decompose under the action of strong acid, strong alkali and water vapor, and has good resistance to organic solvents and weather. Because of its many advantages, PET plastic has always been very popular. However, because its whiteness is not enough to meet the aesthetic requirements of consumers, it is necessary to add chemical additives to improve it. PET plastic fluorescent whitening agent is a good choice.

Commonly used models of PET fluorescent whitening agents are OB, OB-1 and KSN.

Fluorescent whitening agent OB, appearance: pale yellow powder, tasteless; Melting point: 196-203℃; Color: bright blue light. Good light transmittance, suitable for transparent plastic products, paint and ink industries. Low toxicity, environmental protection requirements, light color, pure color and moderate price. Solubility: Insoluble in water, soluble in alkane, mineral oil and common organic solvents.

Optical brightener OB-1, appearance: light yellow powder, insoluble in water, odorless, stable performance; Color: blue light or blue-violet light; It is suitable for whitening chemical fibers such as polyester fiber, nylon fiber and polypropylene fiber. Whitening and brightening of plastics, rigid PVC, ABS, EVA, PET, polycarbonate, etc.

Fluorescent whitening agent KSN, with the appearance of yellow-green crystalline powder and melting point of 27℃, is insoluble in water, odorless and stable in performance. Mainly used for whitening films of polyester fibers and plastic products, polymer fibers such as polyamide and polypropylene, injection molding and extrusion molding materials, etc. Especially suitable for high-temperature plastics and engineering plastics.